Fuel pump



y 31, c. J. LAUER ETAL 2,380,656

FUEL rim? Filedsept. 11, 1940 2 Sheets-Sheet l Qtlelazz L'aaet & Qty ,5. 6010a July 31, 1945.

'c. J. LAUER ETAL.

FUEL PUMP Filed Sept; 11. 1940 2 Sheets-Sheet 2 v Zhwentois Q2/2201? 62112! egg Patented July 31', i945 CarletonJ.liaues'andBoyLBewen,Filnt,Midn,,.

lotorscorporatiomlleasslgnors. to

General troit, Miehq a corporation of Delaware I Application September 11, Ramses-la! No; 856.!

s Claims. .(CLMHZ) This invention relates to a fuel supp system for engines and more particularly-to the fuel supply system for the mine of a, motor vehicle.

An obiect of the invention is to avoid the conversion of liquid fuel into vapor in a supply system using a pump in the conduit leading-from the tank to the carburetor.

As another object the novel supply system uses the fuel itself as the lubricating medium for the bearings of the motor which drives the pump, and the inventive idea'is embodied in a construction wherein leakage and evaporation i avoided.

Many other objects and advantases will become evident as one reads the description which follows:

lnthe drawings:

Figure l is a vertical section through the novel pump and sediment collectina chamber.

Figure 2 is a section as indicated by line I-Ion I l'ilili'e 1.

Figure sis a section as indicated by line s-t ofFigure 1.

Flame 4 is a section as indicatedby H' ofl'ialire l. Figure 6 isa sectionas indicated byline H onFizure 2.

' Referring by numerals to the drawings, there is illustrated a fuel'tank marked II. This is intended to be the iuel reservoir mounted near the end of a motor vehicle. The fuel from this is to be delivered to the carburetor and.

act be lifted for which purpose some sort of amp is required. In many vehicles a variable stroke pump is located near the engine so that its moving parts maybe actuated by the'mov- 5' in parts of the emrine. Such pumps operate as a result of the creation of suction and the sucmost installations; this means that the 'fuel.

cover member ll associatedwith a'fuelstra'inar and sediment trap designatedas a whole by numeral i1. Also associated with the cover memher is a'pump and motor assembly marked ll. 5 The cover it has a passage 2| leading from its threaded end 28 where it is connected to the tankoutle't it. A plug 2| separates this passaae from a coaxial passage Tl. A passage 2' leads from passage II to and throu'ah the bottom of the in cover ll. A bowl ll, for the collection of sediment and water fromthe fuel, is secured to the underside .of the cover by conventional retaininl means including a bail. screw and nut assemv bly 83. Between thebowi andthe cover is a filter 15 screen II and a gasket 81. The cover has another longitudinal passage- 3| terminating over the bowl and from its end a vertical passage ll to extends to bottom surface of the cover. It will be seen from 3 that the filter screen is go fitted around the openinls II and so that the fuel from the enters the'bowl in the realm below the screen.. Above the screen'is an open mg I within the cover communicatinc with pas sage 21. It will be understood that any water,

g and sediment in the fuel is separated from the fuel by the expedientdescribed and that it coilects in the bottom of the bowl from which it can bereadily removed. .A motor case II is secured beneath the cover so by' fastening means" (rig. is). A pump sear bearlna casing 48 fits within the upper part of the case ll and is secured to the cover by fasten ing means ll. neferring'arain to the cover, it

v will" be observed that at the end of passage 21 as remote from passage ,43 is a passace it which communicates with'a space I! in the casing .40 leading to the pump chamber 51. Fromehamber .ll a pa'ssaee ll extends upwardly and opens into tion tendsto vaporize' the liquid. The present the cover passage ,the opening I invention aims to avoid the creation of anyapso by-numeral ll. The gear has an openin; which extends from the opening ti through the being indicated.

preciable suction. In the drawings thepump 1 shownislocated near the tank andthe'outlet' llfromthetankisnearthebottomof-thetank.

whereby the suction, if'any. developed bythe pump located near the outlet of the tank is negjligible. The 'invention is not, limited to. a construction in which the fuel fiows by gravity to the pump but it is intended that the positional thepumpshallbesuchastominimiseth'esuction required to draw the'fuel from the tank.

Betweenthe pump and the carburetor will be subject to positlvep'ressure. 'lhepiunpis driven by an electric motor as bottom wall thereof as shown-by dotted lines!!! Within the pump chamber are pump gears'iland d1. gear I being driven byv an electric motor to be referred to and gear I! being an idler. 'On

-- theunderside ofgea'rcasina ll arepairsofbosses so audit. There is aisoaspherical-recess l3 for seating shearing". The electric motor by which h mm'p leafs are driven includes a fixed field assembly 11 heldinpositionbyspin ll extendina frounthebase of the motor case. A

Fl. 1. At ll is a threaded opening at-the end of p'assale II for connection with a pipe for'convey- 45 log liquid fuel from the pump to the carburetor.

' assembly.

- -pump developed suction, little owing to the fact in contact with a thrust 08 takes the term a hardened welch plug which thus provided with self- .l singbearingllisarstainerassemblyllsecured upwardly irom occasion threaded plug for requires.

bearing II. Bearing case. Asimilarre-' Electrical connection is provided'at ill. An external wire. not shown. is connected at this point and communicates with an internal lead I.

,,Within the sediment trap'a disc-shaped valve is? is adapted to be held asalnst a seat It! at byaspring m. The

which are received within bosses ii'l formed on the underside or the cover. The shell has openings in through which fluid may pass and enter the bowl when the valve disc is depressed by the pressure or liquid fuel and against the resilient resistance or the spring.

The assembly may be mounted by a bracket comprising a pair oi clamping arms iii embracing the motor unit, It. The arms III are engaged with a rubber carrying tached to the vehicle frame. The assembly may be placed in {my position of vertical or rotatable adjustment within the arms Ill which are adapted to be clamped by conventional screw and nut means ill. Obviously any convenient substitute may be used trated to accommodate for the position of the The electrical connection preferably includes a ground lead. be eii'ected by such a member as I21 between the metal parts or the brackets which are otherwise insulated by the rubber element.

. when the gnition rotates and drives the pump gears. Fuel thereupon flows to the pump from the reservoir. It iiows either under the influence of a slight pressure'head or; it"assembled so as'to'require'a that the pump is adjustably m'ounted on the frame adjacent the tank.- The absence 0! appreciable suction avoids evaporation ot iuel. From the pump tothe carburetor the fuel is subiect to pum pressure, whereby danger of evaporation is avoided. The capacity oi the pump issuiilcient to supply themaximum needs oi the carburetor. Since the pumpis in continuous operation and since it always supplies at least a little fuel more than the mands, there is at all times some ilow of fuel through the bypass including, the valve III. This valve is therefore normally slightly open and duetuates gently under the influence how of fuel through spring Ill. It never its seat. Since the of the varyinl the bypass and the pressure intermittently pounds against lower bearing 0! tbcmotor member it! adapted to be at-' the suction will be butmotor case.

. thcpump'maybt instead or the connection is illus-- This may conveniently switch is closed, the motor 'thusbecominga QMOSO tionedbetweenthe'ileldassemblyandtheg ar umature'isatthebottomoithecasatbereisno casing. 'lhemotoralsoincludesanarmature .danger oilossotlubricatlng ediumi'romleakassembly '8 irom whichextend spindles Is andage. Itisthereiore we toprovide adpindle llextendsthro bearing" and ditionalsealingmeansatthebcaringashasbeen at its end non-rotatably carries gear II. The I done heretoiore when the motor was arranged bottomotthemotorcasehasaconcavedseatls abovethepumn 'Ihemoiorcaseisnotopento iorthereceptionoiabearingtithro hwhich theairandevaporationlsthus avoided. This. passesthesplndlesttheendoithesplndlebeing too.helpstoinsureadequatalnbrication Itwill sediment collecting bowl II. If this is neglected andwater collects withinthemotorcaseitmav to burn out. As an added may be used. me use of a gear pump with. out valves insures quietness oi operation.

We claim: 1. In combination, a fuel tank of a motor vehicle and a conduit therefrom to supply the carburetor oi' the cosine. said conduit having a-flrst part and a second part, a iuel pump assembly 2 mounted between said first part and said second part oi the conduit, said assembly including a a motor and a superposed pump within said case, means forming a bypass between the high and low pressure'sides oi! said pump, said pump having an outlet, means forming passages to deliver fuel from said outlet to the motor case where it serves to lubricate bearlugs, to the second part of the conduit for supplying the carburetor and to the bypass whereby driven continuoinly regardless of the fuel demand of the engine.

2. The invention defined by claim 1 together with a pump gear casing within said case, said casing having a through opening constituting the pasage from the pump outlet to the motor case andilsohavingabearingsuri'aceioroneoi the bearings oi the armature oi the motor, the bottom wall of the motor case shaped to term a bearing suriace tor a second armature bearing.

3. 'lheinvention defined by claim 1, said as- .sembly also including a sediment trap adjacent ot'the conduit and through which the iuel passes to the I valve within said trap and afiording communication between the pump outlet and the trap and part oi said ypass.

4. Incombination withtheiueltankoiamotor vehicle and a conduit extending thereirom to supply a carburetor, a fuel supply assembly for pumping iuel irom said said assembly constituting a part oi said conensine dedu'it and including-.a ,c'over containing ilrst and second passages. the first for connection with the tank. the-second for connection with the carburetor. a pump casing secured to and beneath said cover, pumping means in said casing, said casing passages whereby the inlet and outlet of thepump communicates with the first andsecondpassages respectively. a motor case beneath said pump casing, a motor therein oper ably connected to said pumping means and a sediment trap constituting a part at said first mentioned passage.

5. In combination with the iueltankoi amotor notbercachedbyany.

Btalling oi the motor will not cause it precaution. low ampere p mp. and a spring loaded tanktothecarburetor a bypass between the vehicle and a conduit extending therefrom to supply a carburetor, a fuel supply assembly for pumping fuelfrom said tank to the carburetor,'

said assembly constituting a part of said conduit and includinga cover containing first and second passages, the first for connection with the tank, the second for connection with the carburetor, a pump casing secured to and beneath said cover, pumping means in said casing, said casing having passages whereby the inlet and outlet of the pump communicates with the first and second passages respectively, a motor case beneath said pump casing, a motor therein operably connected to said pumping means and a sediment trap constituting a part of said first mentioned passage, said pump casing having a passage therethrough whereby fuel may be supplied to the motor bearings.

6. In combination with the fuel tank of a motor vehicle and a conduit extending therefrom to supply a carburetor, a fuel supply assembly for pumping fuel from said tank to the carburetor, said assembly constituting a part of said conduit and including a cover containing first and second passages, the first for tank, the second for connection with the carburetor, a pump casing secured to and beneath said cover, pumping means in said casing, said casing having passages outlet of the pump communicates with-the first and second passages respectively; a motor case beneath said pump casing, a motor therein operably connected to said pumping means and a sediment trap constituting a part of said flrstmentioned passage, together with passages forming tlet and inlet of the connection with the whereby the inlet/and- I vehicle and a "the inlet and outlet of the pump, a spring loaded valve in said sediment trap forming a part of said bypass.

7. In combination with the fuel tank of a motor vehicle and a two part conduit extending therefrom to supply a carburetor, a fuel pump assembly mounted between said parts of the conduit, said assembly including a motor case, a motor an a pump above the motor and within said case, means forming a bypass between the high and low pressure sides of said pump, said pump having an outlet, means forming passages to deliver fuel from said outlet to the motor case where it serves to lubricate bearings, to the second part of the conduit for supply the carburetor and to the bypass whereby the pump may be driven continuously regardless of the fuel demand of the engine.

8. In combination with the fuel tank of a motor conduit extending therefrom to supply'a carburetor, a fuel supply assembly for pumping fuel from said tank to the carburetor, said assembly constituting a part of said conduit and including a cover containing first and second passages, the first for connection with the tank, the second for connection with the carburetor, a pump casing beneath said cover pumping means and a dr'ving motor therefor within said casing, said casing having passages whereby pump communicate with the first and second passages respectively, a sediment trap constituting a part of said first mentioned passage, said pump casing also having a passage whereby fuel may be supplied to the motor bearings.

CARLETON J. LAUER. ROY L. BOWERS. 

